Dyop® - Dynamic Optotype™

Helping the world see clearly, one person at a time




Personal Vision

Infant Vision

Color Screening

Professional Use


How it works

Using the Test

Visual Impairment

How it works

Using the Test



How Progressive Lenses limit peripheral vision


Adobe Flash Graphics format


Click here to take the Dyop™ Peripheral Vision Test – Gray Background

Adobe Flash Graphics format



Note: The Dyop™ vision tests are for screening purposes only and are NOT a substitute for an examination by a licensed vision care professional.  All of the Dyop™ Vision Tests are in an Adobe Flash Graphic format and may be viewed using Internet Explorer (with ActiveX enabled) or Google Chrome or Firefox or Safari or other graphic viewers such as Irfanview with the Flash Graphic plug-ins or using the free Adobe Flash Graphic Viewer enabled.  Because they use FLASH, the Dyop™ tests will NOT work on an iPad or iPhone unless you use the Photon Browser


Progressive lenses have a narrow vertical field of clear, undistorted vision due to the astigmatic (dyslexic) areas on each side of the undistorted vertical progressive range where the magnification changes with the viewing angle of the lenses.  Wearers of single vision lenses, bifocals, or trifocals DO NOT see any distortion.











Progressive lenses inherently have astigmatic (dyslexic) areas (in gray).

Note: the area of undistorted vision is based upon the wearers’ perspective.

See a method for verifying the alignment of progressive lenses…….


Reading is a skill that human beings developed only about 3500 years ago after millions of years of evolution.  What optometrists and ophthalmologists frequently do NOT realize is that you don't read one word of the time.  You read phrases and you read “concepts.”  Only seeing one word at a time makes it difficult to understand concepts because concepts are not single words.  Concepts are phrases.  The narrow visual range of progressive lenses makes it difficult to read because it focuses you on that narrow range of clear vision. 


The Dyop™ Peripheral Vision Test is ONLY for use with progressive glasses wearers to demonstrate the problems of image distortion outside of the UNDISTORTED central vision areas, and to assist in measuring the percent area range of your monitor where you have limited peripheral vision.  On a 22 inch diagonal monitor, viewed at a distance of 28 inches (~72 cm), your monitor will have a total viewing range of 30 arc degrees.  On a 15 inch diagonal monitor, viewed at a distance of 28 inches (~72 cm), your monitor will have a total viewing range of 20 arc degrees.














                       Screen shot of the Dyop™ Peripheral Distortion Test



To use the test, sit at a Viewing Distance of 28 inches (~72 cm) from your monitor and select either the Left Test or the Right Test.  Focus on either the Left or Right Fixation Point (+) and then MOVING ONLY YOUR EYES, and NOT your head, note the rotation of Dyops™ in the dyslexic areas of your lenses as being either clockwise or counter-clockwise.  The percent number below the beginning of noticeable distortion is the percent arc degree width of your monitor for the UNDISTORTED viewing area of your progressive lenses.














Reverse screen shot of the blurred peripheral Dyops™ images.____


















Illustration of the color shift inherent in progressive lens peripheral vision.




For a further discussion of the peripheral distortion associated with progressive lenses go to www.InducedDyslexia.com


The Dyop™ (Dynamic Optotype™) tests and concept are covered under U.S. Patent US 8,083,353

and International Published Patent WO 2011/022428.

For further information contact: Allan Hytowitz at Allan@Dyop.org

5035 Morton Ferry Circle, Alpharetta, GA, 30022   /   678-893-0580

Copyright©2018 DyopVision™ Associates.  All Rights Reserved.